2020 Mercedes AMG C-Class Coupe vs. 2019 Audi S5

Detailed Review, Specifications & Comparison

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Safety

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Using vehicle speed sensors, smart airbags in the AMG C-Class Coupe deploy with different levels of force or don’t deploy at all to help better protect passengers of all sizes in different collisions. The AMG C-Class Coupe’s side airbags will shut off if a child is leaning against the door. The S5’s airbags don’t have smart features and will always deploy full force.

The AMG C-Class Coupe’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The S5 doesn’t offer a driver alert monitor.

Both the AMG C-Class Coupe and the S5 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems, around view monitors and rear cross-path warning.

Warranty

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There are over 26 percent more Mercedes dealers than there are Audi dealers, which makes it easier should you ever need service under the AMG C-Class Coupe’s warranty.

Reliability

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J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 12 more problems per 100 vehicles, Audi is ranked 22nd.

Engine

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The AMG C 43 Coupe’s standard 3.0 turbo V6 produces 36 more horsepower (385 vs. 349) and 15 lbs.-ft. more torque (384 vs. 369) than the S5’s 3.0 turbo V6. The AMG C 63 Coupe’s standard 4.0 turbo V8 produces 120 more horsepower (469 vs. 349) and 110 lbs.-ft. more torque (479 vs. 369) than the S5’s 3.0 turbo V6. The AMG C 63 S Coupe’s standard 4.0 turbo V8 produces 154 more horsepower (503 vs. 349) and 147 lbs.-ft. more torque (516 vs. 369) than the S5’s 3.0 turbo V6.

Fuel Economy and Range

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The AMG C-Class Coupe has 2.1 gallons more fuel capacity than the S5 (17.4 vs. 15.3 gallons), for longer range between fill-ups.

Transmission

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A nine-speed automatic (SMG) is standard on the Mercedes AMG C-Class Coupe, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the S5.

The AMG C-Class Coupe offers an available sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The S5 doesn’t offer an SMG or a conventional manual transmission.

The AMG C-Class Coupe V8’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The S5 doesn’t offer launch control.

Brakes and Stopping

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For better stopping power the AMG C-Class Coupe’s front brake rotors are larger than those on the S5:

AMG C 43 Coupe

AMG C 63 S Coupe

S5

Front Rotors

14.2 inches

15.8 inches

13.8 inches

Rear Rotors

12.6 inches

14.2 inches

13 inches

The AMG C-Class Coupe S offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The S5 doesn’t offer ceramic brake rotors.

Tires and Wheels

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Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG C-Class Coupe can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The S5 doesn’t offer run-flat tires.

Suspension and Handling

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The AMG C-Class Coupe’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The S5 doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the AMG C-Class Coupe’s wheelbase is 3 inches longer than on the S5 Coupe (111.8 inches vs. 108.8 inches).

For better handling and stability, the average track (width between the wheels) on the AMG C-Class Coupe is 1.3 inches wider in the front and .3 inches wider in the rear than the track on the S5.

The AMG C 63 S Coupe handles at .98 G’s, while the S5 Prestige Coupe pulls only .94 G’s of cornering force in a Car and Driver skidpad test.

For better maneuverability, the AMG C 63 Coupe’s turning circle is .6 feet tighter than the S5’s (37.1 feet vs. 37.7 feet).

Passenger Space

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The AMG C-Class Coupe has .7 inches more front legroom and 1 inch more rear shoulder room than the S5 Coupe.

Cargo Capacity

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To make loading and unloading groceries and cargo easier, especially for short adults, the AMG C-Class Coupe has a standard power trunk, which opens and closes automatically by pressing a button or just by kicking your foot under the back bumper, completely leaving your hands free. The S5 doesn’t offer a power trunk, so its trunk has to be closed manually.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Mercedes service is better than Audi. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 13% lower rating, Audi is ranked 8th.

Ergonomics

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The AMG C-Class Coupe has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The S5 doesn’t offer a remote starting system.

Unlike the driver-only memory system optional at extra cost in the S5, the AMG C-Class Coupe has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The AMG C-Class Coupe’s standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The S5 doesn’t offer an easy entry system.

To help drivers see further while navigating curves, the AMG C-Class Coupe offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle. The S5 doesn’t offer cornering lights.

The AMG C-Class Coupe’s optional Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The S5 Prestige’s automatic parking system requires operating the brakes and transmission to safely park.

Model Availability

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The AMG C-Class Coupe is available in both rear-wheel drive and all-wheel drive configurations. The S5 doesn’t offer a two-wheel drive configuration.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/02/24

Consumer Reports® recommends the Mercedes AMG C-Class Coupe, based on reliability, safety and performance.

J.D. Power and Associates rated the AMG C-Class Coupe first among compact premium cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The S5 isn’t in the top three.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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